Hole burning torch tip



Nov. 21, 1950 Filed Aug. 25, 1949 E. A. TOMLIN HOLE BURNING TORCH TIP 2Sheets-Sheet 1 AWE/[NTO EMILE 4 7D/WL/A/ ZLSELEWL Nmn 25., mm E. A.TUMLKN HOLE BURNING TORCH TIP 2 Sheets-Sheet 2 Filed Aug. 25, 1949Patented Nov. 21, 1950 UNITED STATES ATENT OFFICE HOLE BURNING TORCH TIPEmile A. Tomlin, Cambridge, Mass.

Application August 23, 1949, Serial No. 111,821

1 Claim. 1

This invention relates to oxy-acetylene torches and more particularly toa hole burning tip for attachment to commercial forms of such torches.

A general object of the invention is to provide a simple yet inexpensiveand efficient tip for attachment to a conventional oxy-acetylene torchfor cutting or burning circular and elongated holes in metal plates,castings and other structural members.

A further object of the invention is to provide a compact hole burningtip together with suitable guiding means which enables a conventionaltorch to be used for cutting holes in an accurate and rapid mannerwithout the aid of expensive jigs, fixtures or stands.

A still further object of the invention is to provide a hole cutting tipassembly which, by interchanging the tip portion of such assembly,allows a conventional torch to be used for cuttin holes and slots ofvarious sizes in a rapid and efiicient manner.

Other object of the invention will in part be obvious and will in partappear hereinafter.

The invention accordingly comprises the fea-, tures of construction,combination of elements, and arrangement of parts, which will beexemplified in the construction hereinafter set forth and the scope ofthe invention will be indicated in the claim.

For a fuller understanding of the nature and objects of the inventionreference should be had to the following detailed description taken inconnection with the accompanying drawing, in which:

Fig. 1 is a perspective view of the complete torch tip of my invention;

Fig. 2 is a vertical cross sectional View taken substantially alonglines 2-2 of Fig. 3 and showing the combustion gas and oxygenpassageways and chambers;

Fig. 3 is a full side elevation of the torch tip as shown in Fig. 1;

Fig. 4 is a side elevation, partly in section, showing the tip held inposition by a conventional oxy-acetylene torch which is indicated bydot-dash lines;

Fig. 5 is a side elevation, partly in section, similar to Fig. 4 butshowing a modified form of body shape as may be used to attach the tipto some conventional torches;

Fig. 6 is another view, partly in section, similar to Figs. 4 and 5 butshowing a further modification in the body shape;

Fig. 7 is a plan view of the front face of the tip showing the relativelocation of the combustion gas and oxygen outlets;

Fig. 8 is another plan View, similar to Fig. 7, but showing how thecombustion gas and oxygen outlets may be further spaced from the centerof the tip for cutting holes of larger size; and, Fig. 9 is a plan viewof the body portion of the torch tips shown in Figs. 5 and 6, the tipportion having been removed.

Referring to the drawing, the torch tip assembly of my inventioncomprises a body portion II], a burner tip ll, an adjustable pivotmember 12, and a locknut 45.

The body portion ID is cylindrical and its rear end is provided with anexternally threaded neck l3 from which extends a conical seat 14 and, asshown in Fig. 4, the neck l3 threads into internal threaded part l5 of aconventional cutting and/or welding torch [8 so that the conical seat Mforms a seal against the mating seat I6 of the torch l8 l aving anoxygen chamber l9 directly opposite to the oxygen supply duct 28 of thetorch l8 which is not in itself a part of this invention.

An annular groove 2| in the conical seat l4 provides a primaryoxy-acetylene or combustion gas chamber 22 which aifords communicationwith the combustion gas duct 23 of the torch I8.

The body portion I8 is provided with an axial passageway 24 which initself forms a chamber to conduct oxygen from the chamber [9 to the tiphereinafter described.

An external thread 25 is provided on the periphery of the body H] andthe burner tip II is threaded thereto and the holes 26 in the tip andthe holes 2i in the body portion serve as anchors for a spanner wrenchto tighten or remove the tip from the body portion.

The end of the body I0 is provided with a seat face 28 having formedtherein a circular groove forming a secondary combustion gas chamber 29which is connected to the primary combustion gas chamber 22 by theannular series of combustion gas passageways 3 l.

A cavity or depression 32 is formed in the surface of the tip H whichseats against the seat face 28 of the body and this depression forms asecondary oxygen chamber 33 in alinement with the axial oxygen supplypassage 24. A series of passageways 34 extend radially from within thedepression 32 and angularly through the tip II where they merge with anannular series of oxygen outlets 36 in the front face 35 of the tipspaced equidistant, preferably at and. at a determined distance from thecenter of the tip.

An annular series of combustion gas passageways 38 are provided in thetip II, and as shown in Figs. 2 and 8, these communicate with thesecondary combustion gas chamber 29. The pas-

